drivers/gpu/drm/exynos/exynos_drm_vidi.c

   1 /* exynos_drm_vidi.c
   2  *
   3  * Copyright (C) 2012 Samsung Electronics Co.Ltd
   4  * Authors:
   5  *      Inki Dae <inki.dae@samsung.com>
   6  *
   7  * This program is free software; you can redistribute  it and/or modify it
   8  * under  the terms of  the GNU General  Public License as published by the
   9  * Free Software Foundation;  either version 2 of the  License, or (at your
  10  * option) any later version.
  11  *
  12  */
  13 #include <drm/drmP.h>
  14
  15 #include <linux/kernel.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/component.h>
  18 #include <linux/timer.h>
  19
  20 #include <drm/exynos_drm.h>
  21
  22 #include <drm/drm_edid.h>
  23 #include <drm/drm_crtc_helper.h>
  24 #include <drm/drm_atomic_helper.h>
  25
  26 #include "exynos_drm_drv.h"
  27 #include "exynos_drm_crtc.h"
  28 #include "exynos_drm_fb.h"
  29 #include "exynos_drm_plane.h"
  30 #include "exynos_drm_vidi.h"
  31
  32 /* VIDI uses fixed refresh rate of 50Hz */
  33 #define VIDI_REFRESH_TIME (1000 / 50)
  34
  35 /* vidi has totally three virtual windows. */
  36 #define WINDOWS_NR              3
  37
  38 #define ctx_from_connector(c)   container_of(c, struct vidi_context, \
  39                                         connector)
  40
  41 struct vidi_context {
  42         struct drm_encoder              encoder;
  43         struct platform_device          *pdev;
  44         struct drm_device               *drm_dev;
  45         struct exynos_drm_crtc          *crtc;
  46         struct drm_connector            connector;
  47         struct exynos_drm_plane         planes[WINDOWS_NR];
  48         struct edid                     *raw_edid;
  49         unsigned int                    clkdiv;
  50         unsigned int                    connected;
  51         bool                            suspended;
  52         struct timer_list               timer;
  53         struct mutex                    lock;
  54 };
  55
  56 static inline struct vidi_context *encoder_to_vidi(struct drm_encoder *e)
  57 {
  58         return container_of(e, struct vidi_context, encoder);
  59 }
  60
  61 static const char fake_edid_info[] = {
  62         0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05,
  63         0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78,
  64         0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd,
  65         0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
  66         0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00,
  67         0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e,
  68         0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00,
  69         0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18,
  70         0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
  71         0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47,
  72         0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1,
  73         0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83,
  74         0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00,
  75         0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c,
  76         0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a,
  77         0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00,
  78         0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
  79         0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00,
  80         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  81         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  82         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  83         0x00, 0x00, 0x00, 0x06
  84 };
  85
  86 static const uint32_t formats[] = {
  87         DRM_FORMAT_XRGB8888,
  88         DRM_FORMAT_ARGB8888,
  89         DRM_FORMAT_NV12,
  90 };
  91
  92 static const enum drm_plane_type vidi_win_types[WINDOWS_NR] = {
  93         DRM_PLANE_TYPE_PRIMARY,
  94         DRM_PLANE_TYPE_OVERLAY,
  95         DRM_PLANE_TYPE_CURSOR,
  96 };
  97
  98 static int vidi_enable_vblank(struct exynos_drm_crtc *crtc)
  99 {
 100         struct vidi_context *ctx = crtc->ctx;
 101
 102         if (ctx->suspended)
 103                 return -EPERM;
 104
 105         mod_timer(&ctx->timer,
 106                 jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);
 107
 108         return 0;
 109 }
 110
 111 static void vidi_disable_vblank(struct exynos_drm_crtc *crtc)
 112 {
 113 }
 114
 115 static void vidi_update_plane(struct exynos_drm_crtc *crtc,
 116                               struct exynos_drm_plane *plane)
 117 {
 118         struct drm_plane_state *state = plane->base.state;
 119         struct vidi_context *ctx = crtc->ctx;
 120         dma_addr_t addr;
 121
 122         if (ctx->suspended)
 123                 return;
 124
 125         addr = exynos_drm_fb_dma_addr(state->fb, 0);
 126         DRM_DEBUG_KMS("dma_addr = %pad\n", &addr);
 127 }
 128
 129 static void vidi_enable(struct exynos_drm_crtc *crtc)
 130 {
 131         struct vidi_context *ctx = crtc->ctx;
 132
 133         mutex_lock(&ctx->lock);
 134
 135         ctx->suspended = false;
 136
 137         mutex_unlock(&ctx->lock);
 138
 139         drm_crtc_vblank_on(&crtc->base);
 140 }
 141
 142 static void vidi_disable(struct exynos_drm_crtc *crtc)
 143 {
 144         struct vidi_context *ctx = crtc->ctx;
 145
 146         drm_crtc_vblank_off(&crtc->base);
 147
 148         mutex_lock(&ctx->lock);
 149
 150         ctx->suspended = true;
 151
 152         mutex_unlock(&ctx->lock);
 153 }
 154
 155 static const struct exynos_drm_crtc_ops vidi_crtc_ops = {
 156         .enable = vidi_enable,
 157         .disable = vidi_disable,
 158         .enable_vblank = vidi_enable_vblank,
 159         .disable_vblank = vidi_disable_vblank,
 160         .update_plane = vidi_update_plane,
 161         .atomic_flush = exynos_crtc_handle_event,
 162 };
 163
 164 static void vidi_fake_vblank_timer(unsigned long arg)
 165 {
 166         struct vidi_context *ctx = (void *)arg;
 167
 168         if (drm_crtc_handle_vblank(&ctx->crtc->base))
 169                 mod_timer(&ctx->timer,
 170                         jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);
 171 }
 172
 173 static ssize_t vidi_show_connection(struct device *dev,
 174                                 struct device_attribute *attr, char *buf)
 175 {
 176         struct vidi_context *ctx = dev_get_drvdata(dev);
 177         int rc;
 178
 179         mutex_lock(&ctx->lock);
 180
 181         rc = sprintf(buf, "%d\n", ctx->connected);
 182
 183         mutex_unlock(&ctx->lock);
 184
 185         return rc;
 186 }
 187
 188 static ssize_t vidi_store_connection(struct device *dev,
 189                                 struct device_attribute *attr,
 190                                 const char *buf, size_t len)
 191 {
 192         struct vidi_context *ctx = dev_get_drvdata(dev);
 193         int ret;
 194
 195         ret = kstrtoint(buf, 0, &ctx->connected);
 196         if (ret)
 197                 return ret;
 198
 199         if (ctx->connected > 1)
 200                 return -EINVAL;
 201
 202         /* use fake edid data for test. */
 203         if (!ctx->raw_edid)
 204                 ctx->raw_edid = (struct edid *)fake_edid_info;
 205
 206         /* if raw_edid isn't same as fake data then it can't be tested. */
 207         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
 208                 DRM_DEBUG_KMS("edid data is not fake data.\n");
 209                 return -EINVAL;
 210         }
 211
 212         DRM_DEBUG_KMS("requested connection.\n");
 213
 214         drm_helper_hpd_irq_event(ctx->drm_dev);
 215
 216         return len;
 217 }
 218
 219 static DEVICE_ATTR(connection, 0644, vidi_show_connection,
 220                         vidi_store_connection);
 221
 222 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
 223                                 struct drm_file *file_priv)
 224 {
 225         struct vidi_context *ctx = dev_get_drvdata(drm_dev->dev);
 226         struct drm_exynos_vidi_connection *vidi = data;
 227
 228         if (!vidi) {
 229                 DRM_DEBUG_KMS("user data for vidi is null.\n");
 230                 return -EINVAL;
 231         }
 232
 233         if (vidi->connection > 1) {
 234                 DRM_DEBUG_KMS("connection should be 0 or 1.\n");
 235                 return -EINVAL;
 236         }
 237
 238         if (ctx->connected == vidi->connection) {
 239                 DRM_DEBUG_KMS("same connection request.\n");
 240                 return -EINVAL;
 241         }
 242
 243         if (vidi->connection) {
 244                 struct edid *raw_edid;
 245
 246                 raw_edid = (struct edid *)(unsigned long)vidi->edid;
 247                 if (!drm_edid_is_valid(raw_edid)) {
 248                         DRM_DEBUG_KMS("edid data is invalid.\n");
 249                         return -EINVAL;
 250                 }
 251                 ctx->raw_edid = drm_edid_duplicate(raw_edid);
 252                 if (!ctx->raw_edid) {
 253                         DRM_DEBUG_KMS("failed to allocate raw_edid.\n");
 254                         return -ENOMEM;
 255                 }
 256         } else {
 257                 /*
 258                  * with connection = 0, free raw_edid
 259                  * only if raw edid data isn't same as fake data.
 260                  */
 261                 if (ctx->raw_edid && ctx->raw_edid !=
 262                                 (struct edid *)fake_edid_info) {
 263                         kfree(ctx->raw_edid);
 264                         ctx->raw_edid = NULL;
 265                 }
 266         }
 267
 268         ctx->connected = vidi->connection;
 269         drm_helper_hpd_irq_event(ctx->drm_dev);
 270
 271         return 0;
 272 }
 273
 274 static enum drm_connector_status vidi_detect(struct drm_connector *connector,
 275                         bool force)
 276 {
 277         struct vidi_context *ctx = ctx_from_connector(connector);
 278
 279         /*
 280          * connection request would come from user side
 281          * to do hotplug through specific ioctl.
 282          */
 283         return ctx->connected ? connector_status_connected :
 284                         connector_status_disconnected;
 285 }
 286
 287 static void vidi_connector_destroy(struct drm_connector *connector)
 288 {
 289 }
 290
 291 static const struct drm_connector_funcs vidi_connector_funcs = {
 292         .fill_modes = drm_helper_probe_single_connector_modes,
 293         .detect = vidi_detect,
 294         .destroy = vidi_connector_destroy,
 295         .reset = drm_atomic_helper_connector_reset,
 296         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 297         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 298 };
 299
 300 static int vidi_get_modes(struct drm_connector *connector)
 301 {
 302         struct vidi_context *ctx = ctx_from_connector(connector);
 303         struct edid *edid;
 304         int edid_len;
 305
 306         /*
 307          * the edid data comes from user side and it would be set
 308          * to ctx->raw_edid through specific ioctl.
 309          */
 310         if (!ctx->raw_edid) {
 311                 DRM_DEBUG_KMS("raw_edid is null.\n");
 312                 return -EFAULT;
 313         }
 314
 315         edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
 316         edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
 317         if (!edid) {
 318                 DRM_DEBUG_KMS("failed to allocate edid\n");
 319                 return -ENOMEM;
 320         }
 321
 322         drm_mode_connector_update_edid_property(connector, edid);
 323
 324         return drm_add_edid_modes(connector, edid);
 325 }
 326
 327 static const struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
 328         .get_modes = vidi_get_modes,
 329 };
 330
 331 static int vidi_create_connector(struct drm_encoder *encoder)
 332 {
 333         struct vidi_context *ctx = encoder_to_vidi(encoder);
 334         struct drm_connector *connector = &ctx->connector;
 335         int ret;
 336
 337         connector->polled = DRM_CONNECTOR_POLL_HPD;
 338
 339         ret = drm_connector_init(ctx->drm_dev, connector,
 340                         &vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
 341         if (ret) {
 342                 DRM_ERROR("Failed to initialize connector with drm\n");
 343                 return ret;
 344         }
 345
 346         drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
 347         drm_mode_connector_attach_encoder(connector, encoder);
 348
 349         return 0;
 350 }
 351
 352 static void exynos_vidi_mode_set(struct drm_encoder *encoder,
 353                                struct drm_display_mode *mode,
 354                                struct drm_display_mode *adjusted_mode)
 355 {
 356 }
 357
 358 static void exynos_vidi_enable(struct drm_encoder *encoder)
 359 {
 360 }
 361
 362 static void exynos_vidi_disable(struct drm_encoder *encoder)
 363 {
 364 }
 365
 366 static const struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = {
 367         .mode_set = exynos_vidi_mode_set,
 368         .enable = exynos_vidi_enable,
 369         .disable = exynos_vidi_disable,
 370 };
 371
 372 static const struct drm_encoder_funcs exynos_vidi_encoder_funcs = {
 373         .destroy = drm_encoder_cleanup,
 374 };
 375
 376 static int vidi_bind(struct device *dev, struct device *master, void *data)
 377 {
 378         struct vidi_context *ctx = dev_get_drvdata(dev);
 379         struct drm_device *drm_dev = data;
 380         struct drm_encoder *encoder = &ctx->encoder;
 381         struct exynos_drm_plane *exynos_plane;
 382         struct exynos_drm_plane_config plane_config = { 0 };
 383         unsigned int i;
 384         int ret;
 385
 386         ctx->drm_dev = drm_dev;
 387
 388         plane_config.pixel_formats = formats;
 389         plane_config.num_pixel_formats = ARRAY_SIZE(formats);
 390
 391         for (i = 0; i < WINDOWS_NR; i++) {
 392                 plane_config.zpos = i;
 393                 plane_config.type = vidi_win_types[i];
 394
 395                 ret = exynos_plane_init(drm_dev, &ctx->planes[i], i,
 396                                         &plane_config);
 397                 if (ret)
 398                         return ret;
 399         }
 400
 401         exynos_plane = &ctx->planes[DEFAULT_WIN];
 402         ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
 403                         EXYNOS_DISPLAY_TYPE_VIDI, &vidi_crtc_ops, ctx);
 404         if (IS_ERR(ctx->crtc)) {
 405                 DRM_ERROR("failed to create crtc.\n");
 406                 return PTR_ERR(ctx->crtc);
 407         }
 408
 409         drm_encoder_init(drm_dev, encoder, &exynos_vidi_encoder_funcs,
 410                          DRM_MODE_ENCODER_TMDS, NULL);
 411
 412         drm_encoder_helper_add(encoder, &exynos_vidi_encoder_helper_funcs);
 413
 414         ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_VIDI);
 415         if (ret < 0)
 416                 return ret;
 417
 418         ret = vidi_create_connector(encoder);
 419         if (ret) {
 420                 DRM_ERROR("failed to create connector ret = %d\n", ret);
 421                 drm_encoder_cleanup(encoder);
 422                 return ret;
 423         }
 424
 425         return 0;
 426 }
 427
 428
 429 static void vidi_unbind(struct device *dev, struct device *master, void *data)
 430 {
 431         struct vidi_context *ctx = dev_get_drvdata(dev);
 432
 433         del_timer_sync(&ctx->timer);
 434 }
 435
 436 static const struct component_ops vidi_component_ops = {
 437         .bind   = vidi_bind,
 438         .unbind = vidi_unbind,
 439 };
 440
 441 static int vidi_probe(struct platform_device *pdev)
 442 {
 443         struct vidi_context *ctx;
 444         int ret;
 445
 446         ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
 447         if (!ctx)
 448                 return -ENOMEM;
 449
 450         ctx->pdev = pdev;
 451
 452         setup_timer(&ctx->timer, vidi_fake_vblank_timer, (unsigned long)ctx);
 453
 454         mutex_init(&ctx->lock);
 455
 456         platform_set_drvdata(pdev, ctx);
 457
 458         ret = device_create_file(&pdev->dev, &dev_attr_connection);
 459         if (ret < 0) {
 460                 DRM_ERROR("failed to create connection sysfs.\n");
 461                 return ret;
 462         }
 463
 464         ret = component_add(&pdev->dev, &vidi_component_ops);
 465         if (ret)
 466                 goto err_remove_file;
 467
 468         return ret;
 469
 470 err_remove_file:
 471         device_remove_file(&pdev->dev, &dev_attr_connection);
 472
 473         return ret;
 474 }
 475
 476 static int vidi_remove(struct platform_device *pdev)
 477 {
 478         struct vidi_context *ctx = platform_get_drvdata(pdev);
 479
 480         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
 481                 kfree(ctx->raw_edid);
 482                 ctx->raw_edid = NULL;
 483
 484                 return -EINVAL;
 485         }
 486
 487         component_del(&pdev->dev, &vidi_component_ops);
 488
 489         return 0;
 490 }
 491
 492 struct platform_driver vidi_driver = {
 493         .probe          = vidi_probe,
 494         .remove         = vidi_remove,
 495         .driver         = {
 496                 .name   = "exynos-drm-vidi",
 497                 .owner  = THIS_MODULE,
 498         },
 499 };